GT 380 Fuse Blowing

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Woodpecker
Posts: 25
Joined: Tue Oct 29, 2019 12:11 pm
Location: Rainham Kent

GT 380 Fuse Blowing

Postby Woodpecker » Mon Dec 09, 2019 1:59 pm

Hello all more help needed
I have just finished a complete rebuild and with your help resolved some issues which I posted earlier.
Having sorted out the lack of charge due to a faulty regulator I have another electrical problem which is driving me mad. I have started and ran the bike for up th 10 minutes in the drive with no issues. Take it on a short ride to the end of the road (200yards) and back and the fuse blows! all within 5 minuess. So far have checked the earths and red wires and disconnected both regulator and rectifier and same problen on the drive OK on the road with me on it fuse blows. I connected a meter in line with the battery red wire next to the fuse and readings no more than 5amps. I have changed the original in line fuse holder to a new push and twist type.
Any suggestions?
Stu in Kent

barney01
Posts: 2671
Joined: Wed Sep 26, 2012 7:33 pm
Location: Prestatyn.Wales

Re: GT 380 Fuse Blowing

Postby barney01 » Mon Dec 09, 2019 3:01 pm

Just to confirm you are using a 20amp fuse? If the fuse only blows after a short ride it must be linked to something that you are operating i.e. the brake light perhaps there is a short there. The other possibilty is perhaps a short or bare wire in the loom close to the forks that comes into contact with the frame when you turn the bars?
NO SMOKE .......NO POKE

Woodpecker
Posts: 25
Joined: Tue Oct 29, 2019 12:11 pm
Location: Rainham Kent

Re: GT 380 Fuse Blowing

Postby Woodpecker » Tue Dec 10, 2019 1:36 pm

Thanks, yes correct fuse and I disconnected the brake light. Still investigating the loom but not found anything significant yet. Just a thought I fitted 3 new sets of points but only 3 new condensers ( at the time only found 2 ) Wahat are the symptons of condenser failure?

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canaletto5
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Joined: Tue Jul 23, 2013 8:43 pm
Location: Derbyshire

Re: GT 380 Fuse Blowing

Postby canaletto5 » Tue Dec 10, 2019 2:14 pm

Make sure there are no trapped wires in the handlebar switches causing a short

barney01
Posts: 2671
Joined: Wed Sep 26, 2012 7:33 pm
Location: Prestatyn.Wales

Re: GT 380 Fuse Blowing

Postby barney01 » Tue Dec 10, 2019 4:11 pm

Condenser failure causes points to burn out dont think thats your problem if bike runs before being ridden.
NO SMOKE .......NO POKE

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KETTLE BOY
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Joined: Tue May 11, 2010 1:05 pm
Location: Stortford, herts

Re: GT 380 Fuse Blowing

Postby KETTLE BOY » Tue Dec 10, 2019 4:37 pm

Woodpecker wrote:Hello all more help needed
I have just finished a complete rebuild and with your help resolved some issues which I posted earlier.
Having sorted out the lack of charge due to a faulty regulator I have another electrical problem which is driving me mad. I have started and ran the bike for up th 10 minutes in the drive with no issues. Take it on a short ride to the end of the road (200yards) and back and the fuse blows! all within 5 minuess. So far have checked the earths and red wires and disconnected both regulator and rectifier and same problen on the drive OK on the road with me on it fuse blows. I connected a meter in line with the battery red wire next to the fuse and readings no more than 5amps. I have changed the original in line fuse holder to a new push and twist type.
Any suggestions?
Stu in Kent


First, I would start the bike, and check the voltage. Then turn on the lights, check voltage.. then put on indicators check voltage.. and if I carry on working fine, with blowing the fuse, then its something your operating, calming the fuse to blow..

A loose wire, a kinked wire, wires rubbing against something sharp.. could be dodgy fuses... it a suck it and see thing.. if it's fine when not riding it, it could be something under the seat, tank, headlight... keep us informed to what it was when you do find out..
GT750 J 1972
GT750 L 1974
Z900 A4 1976
ZZR1100. 1998
Breville Sandwich Maker
I'm never wrong.. Once I thought I was, but I was mistaken.


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slosher
Posts: 707
Joined: Fri Sep 23, 2011 6:55 pm
Location: WALSALL UK

Re: GT 380 Fuse Blowing

Postby slosher » Tue Dec 10, 2019 5:27 pm

Woodpecker wrote: I have started and ran the bike for up th 10 minutes in the drive with no issues. Take it on a short ride to the end of the road (200yards) and back and the fuse blows! all within 5 minuess.

Had the same problem with my 550 years ago.I found that the bike ran fine but kept blowing fuses,checked all the wiring every thing seemed fine.I must have gone through 15 fuses but it was only when riding it.Noticed it was when i changed into 3rd gear when the fuse blew :? :? Anyhow it seems that i had connected the gear change indicator block connector incorrect so for some reason it did allow me to,fitted it with the correct coloured wires it has been fine aver since that was 18yrs ago Dunno may be the same problem

Cheers Dave
GT750L
GT550L
TL1000 97s
T140V
Loctite Trained Engineer :lol:(since having the Bonnie)

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Alan H
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Location: Wombwell, Republic of South Yorkshire

Re: GT 380 Fuse Blowing

Postby Alan H » Wed Dec 11, 2019 8:44 am

Check the wiring to the brake light, especially from the rear brake switch. Or just think what you did immediately before it blew. Use new fuses as old ones get 'tired'.
Proof that four strokes are over complicated

Woodpecker
Posts: 25
Joined: Tue Oct 29, 2019 12:11 pm
Location: Rainham Kent

Re: GT 380 Fuse Blowing

Postby Woodpecker » Sat Dec 14, 2019 9:48 am

Thamks for the suggestions, I disconnected the brake light, removed both handlebar switches and checked the wires for damage, Checked the seat to see that the battery connections are clear of the seat base. current plan is I have unplugged everthing and connected the battery directly to the ignition circuit via the kill switch and intend to add circuits one at at a time! It seemed all right at the first attempt but stopped for a while due to other commitments and rain. Will report back later. Also did a recheck on the coils although I can't see how they will blow a fuse. The secondary coils were down on spec at 11-12 Kohms but prmary ok at 5 ohms.

Woodpecker
Posts: 25
Joined: Tue Oct 29, 2019 12:11 pm
Location: Rainham Kent

Re: GT 380 Fuse Blowing

Postby Woodpecker » Mon Jan 06, 2020 12:23 pm

Hello again
Having cleaned lots of connections, replaced the fuse holder with a better design and checked most of the wireing all seems sorted! Well I have run the bike to the end of my road and back several times (about 200yds) and not have to push it back. Now I have breakdown recover in place I'm ready for a proper ride.
On a seperate matter has anyone run a 380 on synthetic two stroke oil I have some and was thinking of using it?
Thanks to you all for expert help and advice.
Stuart


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